Return-Path: Received: from rly-mc10.mx.aol.com (rly-mc10.mail.aol.com [172.21.164.94]) by air-mc01.mail.aol.com (v126.13) with ESMTP id MAILINMC011-d994b1a30e021d; Sat, 05 Dec 2009 05:07:49 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-mc10.mx.aol.com (v125.7) with ESMTP id MAILRELAYINMC101-d994b1a30e021d; Sat, 05 Dec 2009 05:07:30 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NGrWx-0005UB-9R for rs_out_1@blacksheep.org; Sat, 05 Dec 2009 10:06:23 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NGrWw-0005U2-FZ for rsgb_lf_group@blacksheep.org; Sat, 05 Dec 2009 10:06:22 +0000 Received: from blu0-omc1-s9.blu0.hotmail.com ([65.55.116.20]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NGrWv-0003pL-2G for rsgb_lf_group@blacksheep.org; Sat, 05 Dec 2009 10:06:22 +0000 Received: from BLU146-DS6 ([65.55.116.9]) by blu0-omc1-s9.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.3959); Sat, 5 Dec 2009 02:06:10 -0800 X-Originating-IP: [221.198.86.16] X-Originating-Email: [hellozerohellozero@hotmail.com] Message-ID: From: To: Date: Sat, 5 Dec 2009 10:06:08 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8089.726 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8089.726 X-OriginalArrivalTime: 05 Dec 2009 10:06:10.0252 (UTC) FILETIME=[91A2C8C0:01CA7592] X-Spam-Score: 0.6 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,NO_REAL_NAME=0.55 Subject: LF: PA0RDT probe Content-Type: multipart/alternative; boundary="----=_NextPart_000_000E_01CA7592.908AF020" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=FORGED_HOTMAIL_RCVD,HTML_20_30, HTML_MESSAGE,MISSING_OUTLOOK_NAME,NO_REAL_NAME autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-AOL-IP: 193.82.116.20 ------=_NextPart_000_000E_01CA7592.908AF020 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Loads of discussion recently so I thought Id share the final location= of my PA0RDT probe - this photo taken at sunset today. http://kl1x.co= m/by3akl1x.jpg The braid of the coax from the probe is bonded to th= e balcony which is bonded to the building rebar. At 137Khz this bonding knocks off some 30dB of noise - power supply fo= r the probe is lead acid battery, some 14V. Common mode choke of some= 30T of RG174 before the power injector and Im using just a 4T primary= and secondary type 77 material as the isolating transformer before th= e 50ohm feed to the R75. This is pretty good and flat from 100Khz up= to 15Mhz using the AIM, even heard JA's on 6m! The power injector has 3mH lossy dark Green toriod material if I do us= e an external supply and decoupled using 0.1 polyprops ( as KL 1 X is= wired) -=20 Unwanted Noise injection is still there and comes from a) the Dell AC= PSU - though I have a box of them and choose one that doesn't put a= spoggy on my LF/MF freq - this DC supply again in choked and decouple= d which helps a bit b) serial cable from PC to R75 - tried multiple turns on lossy toroid= which improves things but not perfect. c) slight coupling from the un= used wire input terminal on the R75 if your radio room is located in= a very noisy environment. Picture of present "array" the total length of the copper clad and fli= msy 16 guage wire is 25cms. I employ a 7 element 500Khz LPF between= power injector and the receiver. The key is the coax bonding here - In Alaska the house is wooden fram= e and I don't have much to bond too, though I do bond to anything I ca= n rebar wise. A few 8ft rods and in line chokes help a bit but theres'= nothing like a full Faraday cage which this place has.=20 73 Laurence, bags packed. BY3A KL1X Tanggu China OM89UA=20 ------=_NextPart_000_000E_01CA7592.908AF020 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Loads of discussion recently so I thought Id= share the=20 final location of my PA0RDT probe - this photo taken at sunset today.&= nbsp;http://kl1x.com/by3= akl1x.jpg  =20  The braid of the coax from the probe is bonded to the balcony wh= ich is=20 bonded to the building rebar.
 
At 137Khz this bonding knocks off some 30dB= of noise -=20 power supply for the probe is lead acid battery, some 14V. Common mode= choke of=20 some 30T of RG174 before the power injector and Im using just a 4T pri= mary and=20 secondary type 77 material as the isolating transformer before the 50o= hm feed to=20 the R75. This is pretty good and flat from 100Khz up to 15Mhz using th= e AIM,=20 even heard JA's on 6m!
 
The power injector has 3mH lossy dark Green= toriod=20 material if I do use an external supply and decoupled using 0.1= =20 polyprops ( as KL 1 X is wired) -
 
Unwanted Noise injection is still there and= comes from=20 a) the Dell AC PSU - though I have a box of them and choose one that= doesn=92t put=20 a spoggy on my LF/MF freq - this DC supply again in choked and decoupl= ed which=20 helps a bit
b) serial cable from PC to R75 - tried multi= ple turns on=20 lossy toroid which improves things but not perfect. c) slight coupling= from the=20 unused wire input terminal on the R75 if your radio room is located in= a very=20 noisy environment.
 
Picture of present "array" the total length= of the=20 copper clad and flimsy 16 guage wire is 25cms. I employ a 7 element&nb= sp; 500Khz=20 LPF between power injector and the receiver.
 
The key is the coax bonding here -  In= Alaska the=20 house is wooden frame and I don=92t have much to bond too, though I do= bond to=20 anything I can rebar wise. A few 8ft rods and in line chokes help a bi= t but=20 theres' nothing like a full Faraday cage which this place has.
 
73
Laurence, bags packed.
 
BY3A KL1X Tanggu China OM89UA
 
 
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